Probing the effect of author self-citations on h index: A case study of environmental engineering

  • Authors:

  • Mu-Hsuan Huang;Wen-Yau Cathy Lin

  • Affiliations:

  • Department of Library and Information Science, National Taiwan University, Taiwan;Department of Information and Library Science, Tamkang University, Taiwan

  • Venue:
  • Journal of Information Science
  • Year:
  • 2011

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Abstract

This study evaluates the impact of author self-citations on h index by exploring 583 authors whose works appear in key periodicals in environmental engineering. The findings show that authors' h values have high correlation with authors' article number, total cited count, and their rankings. There is also a high correlation with h index values and rankings of h values. The study indicates that self-citations have little impact on the values of h index and the h index rankings, whether or not articles with authors' self-citation are included. Further investigations reveal that, for authors with high values in h index, the two h index values are both highly correlated and with significant difference either with self-citations or without. A similar pattern is seen in authors with low h values. The results suggest that there is no need to deliberately exclude self-citations in analysing or evaluating research performance in environmental engineering.